Case sometimes assumes unapply applies the same number of args as it takes

[issa-tseng]

In other words, that all unapply functions look something like

(Klass) => (a, b, c) => new Klass(a, (f => f(a, b, c)))

when in reality something like this is possible:

(Klass) => (a, b, c) => new Klass(a, (f => f(a, b + c)))